Fossils can be used to match up rock layers. As organisms change over time, they look different. Older fossils will look different than younger fossils. Some organisms only survived for a short time before going extinct. Knowing what organisms looked like at certain times also helps date rock layers. Some fossils are better than others for this use. The fossils that are very distinct at certain times of Earths history are called index fossils. Index fossils are commonly used to match rock layers. You can see how this works in Figure 2.30. If two rock layers have the same index fossils, then they're probably about the same age. 

How are index fossils useful?


Ace , a wannabe rock star , is on his way to a concert of the band Guitar Wolf when space aliens invade the Earth .  As a result the dead rise to their feet in the countryside setting of Asahi , Japan , with an appetite for flesh .  Enlisting the help of his rock 'n roll blood brother Guitar Wolf , Ace and the members of the band get entangled in many misadventures with crazy rock managers in very tight shorts , transsexuals , naked women shooting guns in the shower , and bloodthirsty zombies ready to tear them apart .  Leather jackets , loud over-modulated music , laser guitar picks , motorcycles , guns , muscle cars , and fire abound .  Guitar Wolf , a Japanese trio signed to Matador Records in the US and self-proclaimed coolest rock band in the world star as the well-coiffed heroes .  It is also a love story , between Ace and Tobio , a trans woman .  The music , in a garage punk vein , plays an important role in the film .  It features music from Greg Cartwright of Reigning Sound and The Oblivians .  His 1997 song `` Twice as Deep '' by Greg Oblivian & the Tip Tops is featured .  This film is similar to another movie by a Spanish punk group , La matanza can bal de los garrulos lis rgicos produced by Siniestro Total 

What genre is the song "Twice as deep"?


The film is set in Igloolik in the Eastern Arctic wilderness at the dawn of the first millennium .  http://atanarjuat.com/legend/legend_film.php The wind is blowing over a bleak snowy landscape while a man tries to herd away some marauding dogs .  We hear the voice of an old man singing a childish song .  Inside a stone house a strange shaman by the name of Tungajuaq , who comes from up north , is singing playfully to the gathered community and camp leader Kumaglak .  But among the spectators there are some mistrustful faces .  Flash forward to another day .  Qulitalik is bidding goodbye to his sister Panikpak , wife of Kumaglak , promising to come if she calls for help in her heart .  She gives him her husband's rabbit's foot for spiritual power .  Qulitalik tells his sister , `` Tulimaq is the one they 'll go after now . ''  It seems that Qulitalik is leaving to escape a threat , and the hope is that one day he will return to help .  As Panikpak watches him leave , we hear a voice-over from a woman : `` We never knew what he was or why it happened .  Evil came to us like Death .  It just happened and we had to live with it . ''  Flash back to the original scene in the stone house .  The visitor and the camp leader Kumaglak are in a `` friendly '' spiritual duel involving binding in leather thongs .  But Panikpak is startled when the stone lamp in front of her breaks in half , and , to the horror of those present , Kumaglak falls over dead .  The visitor removes the leader's walrus-tooth necklace from Kumaglak's body , and , passing by Tulimaq , he puts the necklace around the neck of Sauri , the son of the murdered leader Kumaglak , saying , `` Be careful what you wish for '' . 


What did Panikpak give to her husband?